public static SyntaxList <SyntaxToken> ToTokenList(this SyntaxListBuilder builder)
{
if (builder == null)
{
return(default(SyntaxList <SyntaxToken>));
}
return(new SyntaxList <SyntaxToken>(builder.ToListNode()));
}
public static SyntaxList <TNode> ToList <TNode>(this SyntaxListBuilder builder) where TNode : CSharpSyntaxNode
{
if (builder == null)
{
return(default(SyntaxList <CSharpSyntaxNode>));
}
return(new SyntaxList <TNode>(builder.ToListNode()));
}
internal static CSharpSyntaxNode List(SyntaxListBuilder builder)
{
if (builder != null)
{
return(builder.ToListNode());
}
return(null);
}
internal CompilationUnitSyntax ParseCompilationUnit()
{
SyntaxListBuilder initialBadNodes = null;
var body = new CompilationUnitBodyBuilder(this._pool);
try
{
this.ParseCompilationUnitBody(ref body, ref initialBadNodes, SyntaxKind.CompilationUnit);
var eof = this.EatToken(SyntaxKind.EndOfFileToken);
var result = _syntaxFactory.CompilationUnit(body.Package, body.Imports, body.Members, eof);
if (initialBadNodes != null)
{
// attach initial bad nodes as leading trivia on first token
result = AddLeadingSkippedSyntax(result, initialBadNodes.ToListNode());
this._pool.Free(initialBadNodes);
}
return(result);
}
finally
{
body.Free(this._pool);
}
}
/// <summary>
/// Converts skippedSyntax node into tokens and adds these as trivia on the target token.
/// Also adds the first error (in depth-first preorder) found in the skipped syntax tree to the target token.
/// </summary>
internal SyntaxToken AddSkippedSyntax(SyntaxToken target, CSharpSyntaxNode skippedSyntax, bool trailing)
{
var builder = new SyntaxListBuilder(4);
// the error in we'll attach to the node
SyntaxDiagnosticInfo diagnostic = null;
// the position of the error within the skipedSyntax node full tree
int diagnosticOffset = 0;
int currentOffset = 0;
foreach (var node in skippedSyntax.EnumerateNodes())
{
SyntaxToken token = node as SyntaxToken;
if (token != null)
{
builder.Add(token.GetLeadingTrivia());
if (token.Width > 0)
{
// separate trivia from the tokens
SyntaxToken tk = token.WithLeadingTrivia(null).WithTrailingTrivia(null);
// adjust relative offsets of diagnostics attached to the token:
int leadingWidth = token.GetLeadingTriviaWidth();
if (leadingWidth > 0)
{
var tokenDiagnostics = tk.GetDiagnostics();
for (int i = 0; i < tokenDiagnostics.Length; i++)
{
var d = (SyntaxDiagnosticInfo)tokenDiagnostics[i];
tokenDiagnostics[i] = new SyntaxDiagnosticInfo(d.Offset - leadingWidth, d.Width, (ErrorCode)d.Code, d.Arguments);
}
}
builder.Add(SyntaxFactory.SkippedTokensTrivia(tk));
}
else
{
// do not create zero-width structured trivia, GetStructure doesn't work well for them
var existing = (SyntaxDiagnosticInfo)token.GetDiagnostics().FirstOrDefault();
if (existing != null)
{
diagnostic = existing;
diagnosticOffset = currentOffset;
}
}
builder.Add(token.GetTrailingTrivia());
currentOffset += token.FullWidth;
}
else if (node.ContainsDiagnostics && diagnostic == null)
{
// only propagate the first error to reduce noise:
var existing = (SyntaxDiagnosticInfo)node.GetDiagnostics().FirstOrDefault();
if (existing != null)
{
diagnostic = existing;
diagnosticOffset = currentOffset;
}
}
}
int triviaWidth = currentOffset;
var trivia = builder.ToListNode();
// total width of everything preceding the added trivia
int triviaOffset;
if (trailing)
{
var trailingTrivia = target.GetTrailingTrivia();
triviaOffset = target.FullWidth; //added trivia is full width (before addition)
target = target.WithTrailingTrivia(SyntaxList.Concat(trailingTrivia, trivia));
}
else
{
// Since we're adding triviaWidth before the token, we have to add that much to
// the offset of each of its diagnostics.
if (triviaWidth > 0)
{
var targetDiagnostics = target.GetDiagnostics();
for (int i = 0; i < targetDiagnostics.Length; i++)
{
var d = (SyntaxDiagnosticInfo)targetDiagnostics[i];
targetDiagnostics[i] = new SyntaxDiagnosticInfo(d.Offset + triviaWidth, d.Width, (ErrorCode)d.Code, d.Arguments);
}
}
var leadingTrivia = target.GetLeadingTrivia();
target = target.WithLeadingTrivia(SyntaxList.Concat(trivia, leadingTrivia));
triviaOffset = 0; //added trivia is first, so offset is zero
}
if (diagnostic != null)
{
int newOffset = triviaOffset + diagnosticOffset + diagnostic.Offset;
target = WithAdditionalDiagnostics(target,
new SyntaxDiagnosticInfo(newOffset, diagnostic.Width, (ErrorCode)diagnostic.Code, diagnostic.Arguments)
);
}
return(target);
}
public CSharpSyntaxNode ToListNode()
{
return(_builder.ToListNode());
}
public SeparatedSyntaxList <TNode> ToList()
{
return(_builder == null
? default(SeparatedSyntaxList <TNode>)
: new SeparatedSyntaxList <TNode>(new SyntaxList <CSharpSyntaxNode>(_builder.ToListNode())));
}
